how to fix P0171 code on my Honda CR-V Fifth Generation (2017-2022)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent any electrical shorts.
• Allow the engine to cool before proceeding.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamp pliers, flashlight.
• Use a vacuum gauge to check for leaks in the intake manifold and hoses.
• Tighten or replace any loose or damaged hoses and gaskets found during inspection.

3. Clean or Replace the MAF Sensor

• Tools Required: MAF cleaner, small screwdriver.
• Disconnect the MAF sensor connector.
• Remove the MAF sensor using the screwdriver.
• Clean the sensor gently with MAF cleaner, ensuring no residue is left.
• Allow it to dry, then reinstall the sensor and reconnect the connector.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position (do not start the engine) and check the reading; it should match the manufacturer's specifications (usually around 40-50 psi).
• If the pressure is low, inspect the fuel pump and filter for issues, replacing them if necessary.

5. Inspect and Test Fuel Injectors

• Tools Required: Noid light or stethoscope.
• Disconnect the fuel injector connectors.
• Connect the noid light to check for signal; it should flash when the engine is cranked.
• If no signal is detected, inspect wiring and the Engine Control Unit (ECU) for faults.